Goldman Sachs Just Downgraded This Petroleum Refining Play By: Benzinga via Benzinga April 13, 2015 at 08:36 AM EDT In a report published Monday, Goldman Sachs analysts downgraded the rating on Delek US Holdings, Inc (NYSE: DK) from Buy to Neutral, ... Read More >> Related Stocks: Cvr Energy Inc Marathon Petroleum Phillips 66 Valero Energy